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The Google Code project [Mail Trends](http://code.google.com/p/mail-trends/wiki/GettingStarted) visualizes email in any IMAP mailbox (including Gmail if you have set it up for IMAP). It uses a Python interface to the [Google Charts API](http://code.google.com/apis/chart/) to produce charts of sent and received email organized by time, sender, threads, mailing list, etc.

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